tests: drivers: sdhc: remove mimxrt700_evk/mimxrt798s/cm33_cpu0

Limited by board design and soc, rt700 sdhc only support 1.8V
output and there is no voltage level translators designed on
board. So sdhc function on rt700 board can't meet SD3.0 compatible.

Remove case as solution.

Signed-off-by: Lucien Zhao <lucien.zhao@nxp.com>